oil leak from manifold. - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 08-28-2012, 09:57 PM
all show, all go with a 383
 
Last photo:
Join Date: Aug 2004
Location: illinois
Age: 30
Posts: 95
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
oil leak from manifold.

i have a sbc with a tunnel ram manifold set up for fuel injection. never had a problem with oil leaking from the back of the manifold where it seals against the block until recently.

i had to replace the cam because the distributor hold down cam loose and destroyed the drive gear and the cam gear. in other words, tried pushing the distributor out the top. after all was said and done, while breaking in the new cam, the engine developed a leak from the back of the block by the manifold, i removed the manifold again, and resealed the manifold, only to have he same issue. the oil leak is a consistent drip until the engine is shut off, everything else is dry except for the back of the manifold.

my question, has anyone ever seen a manifold get warped at the back from something like this happening. and why wouldnt the sealant fill that gap if it was warped.

any information is apprecaited.
thanks dan.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-28-2012, 10:41 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,652
Wiki Edits: 0

Thanks: 15
Thanked 58 Times in 55 Posts
One thing to check is the oil pressure sending unit is right beside the distributor. You'll need to check it first to assure the leaks not coming from there. If your positive it's coming from where the blocks china wall meets the intake then one thing that can cause it is crank case gas build up. Since tunnel rams don't use PCV valves then I'm guessing your using breathers in the valve covers. Make sure they are both open as if they are clogged it can build up pressure to the point it forces it out. You said you used sealant on top of the china wall, did you clean the top of the china wall spotless?
Did you use the gasket with sealant on it or just a bead of sealant alone?
I never heard of the intake warping due to the issue with the distributor, however it's possible that it cracked the intake and the crack is not visible to the naked eye.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-29-2012, 06:23 AM
all show, all go with a 383
 
Last photo:
Join Date: Aug 2004
Location: illinois
Age: 30
Posts: 95
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The second time the manifold was off. I removed the plug for the oil pressure port and also resealed that. I'm running the oil pressure sensor from a different location, the one your talking about just has a plug threaded plug in it. But I checked for leaks from there and it's dry.

I never thought about the crankcase pressure. I'm still using a pcv valve in the one vale cover and just a oil fill cap ( nonvented), in the other cover. Is that pressure that high that it could blow out the sealant.

I'm using just sealant along the back of the engine, also have and never had issues until now.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-29-2012, 06:33 AM
delawarebill's Avatar
Registered User
 
Last photo:
Join Date: Mar 2009
Location: delaware
Posts: 1,178
Wiki Edits: 0

Thanks: 13
Thanked 55 Times in 55 Posts
leak'n

i'm sure u did this.. but i mention it anyway..
if u gottta pull it again.. make sure u clean it good with a rag and brake cleaner... if u use the rubber gasket use some RTV top and bottom of it.. if not use a GOOD bead of RTV making use it ooz's out evenly... leave for at least a day to cure..
if u don't want to pull it again (can understand that), clean the area with bk clean and wipe with paper towel... put some rtv on your finger and press it in the mating surface, let that cure too...
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-29-2012, 09:12 AM
Registered User
 
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,159
Wiki Edits: 0

Thanks: 0
Thanked 116 Times in 112 Posts
oil leak from manifold.

It would be best to use a vented breather cap on the other valve cover. Make sure that the valve cover has a baffle under the breather cap to keep oil from splashing on it soaking the filter element. If it isn't baffled use a baffled grommet.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-29-2012, 11:50 AM
1971BB427's Avatar
Registered User
 

Last journal entry: Latest changes
Last photo:
Join Date: Dec 2010
Location: Portland
Posts: 1,416
Wiki Edits: 0

Thanks: 11
Thanked 208 Times in 179 Posts
Quote:
Originally Posted by delawarebill View Post
i'm sure u did this.. but i mention it anyway..
if u gottta pull it again.. make sure u clean it good with a rag and brake cleaner... if u use the rubber gasket use some RTV top and bottom of it.. if not use a GOOD bead of RTV making use it ooz's out evenly... leave for at least a day to cure..
if u don't want to pull it again (can understand that), clean the area with bk clean and wipe with paper towel... put some rtv on your finger and press it in the mating surface, let that cure too...
That's very good advice to let it dry for a day before starting it! I've seen more than one rear seal leak because it was sealed with RTV and started to check as soon as it was finished.
I personally don't use the end seals, but I've seen people use them and RTV them, only to have them push out from the slippery RTV when tightened. If I used them I'd only RTV the ends where they meet the side gaskets, and keep the rest dry so it holds better.
Reply With Quote Quick reply to this message

Recent Hotrodding Basics posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
oil leak at intake manifold 72ardosnova Engine 3 12-20-2011 04:30 PM
intake manifold leak dar timmons Engine 2 03-04-2011 10:19 PM
Intake Manifold Oil Leak - Smallblock 327 Chevy 64Joker Engine 9 11-18-2009 06:41 PM
Help I screwed up - Manifold Oil Leak BB Chevy leejoy Engine 8 03-23-2006 11:10 AM
Can oil leak out of an intake manifold? leastbay Engine 11 08-12-2004 01:55 PM


All times are GMT -6. The time now is 08:52 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.